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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
During the three and six months ended June 30, 2022 and 2021, Wesco granted the following stock options, stock-settled stock appreciation rights, restricted stock units and performance-based awards at the following weighted-average fair values:
Three Months EndedSix Months Ended
June 30,
2022		June 30,
2021		June 30,
2022		June 30,
2021
Stock options granted— — 89,550 — 
Weighted-average fair value$— $— $57.26 $— 
Stock-settled stock appreciation rights granted— 3,398 — 139,592 
Weighted-average fair value$— $38.62 $— $33.19 
Restricted stock units granted— 6,861 224,946 307,583 
Weighted-average fair value$— $86.91 $122.11 $77.12 
Performance-based awards granted— 3,020 83,991 122,812 
Weighted-average fair value$— $86.91 $122.09 $76.76 
Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]
The following table sets forth a summary of stock-settled stock appreciation rights for the six months ended June 30, 2022:
AwardsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual Term (In years)		Aggregate
Intrinsic
Value
(In thousands)
Outstanding at December 31, 2021
1,370,388 $62.09   
     Granted— —   
     Exercised(57,324)65.06  
     Forfeited(2,423)69.44   
Outstanding at June 30, 2022
1,310,641 $61.94 5.7$59,184 
Exercisable at June 30, 2022
1,137,907 $61.73 5.3$51,630 
For the six months ended June 30, 2022, the aggregate intrinsic value of stock-settled stock appreciation rights exercised during such period was $3.9 million.
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
The following table sets forth a summary of time-based restricted stock units for the six months ended June 30, 2022:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2021
974,162 $53.48 
     Granted224,946 122.11 
     Vested(237,977)64.36 
     Forfeited(5,812)85.91 
Unvested at June 30, 2022
955,319 $66.73 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
The following table sets forth a summary of performance-based awards for the six months ended June 30, 2022:
AwardsWeighted-
Average
Fair
Value
Unvested at December 31, 2021
380,819 $59.23 
     Granted83,991 122.09 
     Vested(115,394)54.64 
     Forfeited(2,834)76.80 
Unvested at June 30, 2022
346,582 $75.91 
Stock Appreciation Rights (SARs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair values of stock options and stock-settled stock appreciation rights, as disclosed in the table above, were estimated using the following weighted-average assumptions in the respective periods:
Three Months EndedSix Months Ended
June 30,
2022		June 30,
2021		June 30,
2022		June 30,
2021
Risk free interest raten/a1.3 %1.9 %0.8 %
Expected life (in years)n/a777
Expected volatilityn/a42 %43 %41 %